# Loading time performance regression? **URL:** \ **Category:** Bugs\ **Tags:** gltf\ **Created:** [March 17, 2022, 12:56pm UTC](https://forum.babylonjs.com/t/loading-time-performance-regression/28504 "2022-03-17T12:56:16Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![Leon](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/leon/32/30387_2.png) [@Leon](https://forum.babylonjs.com/u/Leon)\ **Post date:** [March 17, 2022, 12:56pm UTC](https://forum.babylonjs.com/t/loading-time-performance-regression/28504/1 "2022-03-17T12:56:16Z")
There seems to be something in babylon 5 causing it to take very long to load and instanciate. Here are some test models which show the problem. > **[Babylon.js Sandbox - View glTF, glb, obj and babylon files](https://sandbox.babylonjs.com/?assetUrl=https:%2F%2Fcdn.wec360.com%2Fdemo%2Fvisualization-bundle-premium%2Fviews%2Fwebgl-exterior%2FX3w1KXnY@model.glb)** > > Viewer for glTF, glb, obj and babylon files powered by Babylon.js > **[Babylon.js Sandbox - View glTF, glb, obj and babylon files](https://sandbox.babylonjs.com/?assetUrl=https:%2F%2Fcdn.wec360.com%2Fdemo%2Fvisualization-bundle-premium%2Fviews%2Finterior-view%2FDnYRoVYi@model.glb)** > > Viewer for glTF, glb, obj and babylon files powered by Babylon.js # ThreeJS Compared to loading the same model in three.js, it takes a far bit longer. > **[glTF Viewer](https://gltf-viewer.donmccurdy.com/#model=https://cdn.wec360.com/demo/visualization-bundle-premium/views/webgl-exterior/X3w1KXnY%40model.glb)** > > Drag-and-drop preview tool for glTF 2.0 3D models. > **[glTF Viewer](https://gltf-viewer.donmccurdy.com/#model=https://cdn.wec360.com/demo/visualization-bundle-premium/views/interior-view/DnYRoVYi%40model.glb)** > > Drag-and-drop preview tool for glTF 2.0 3D models. # Babylon 4.2 I have also compared the loading times with babylon 4.2 and they are also faster then v5. Has anyone else experienced longer load times? ---
**Author:** ![sebavan](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/sebavan/32/57_2.png) [@sebavan](https://forum.babylonjs.com/u/sebavan)\ **Post date:** [March 17, 2022, 4:26pm UTC](https://forum.babylonjs.com/t/loading-time-performance-regression/28504/2 "2022-03-17T16:26:00Z")
Assigned @bghgary on March 17, 2022, 4:26pm UTC ---
**Author:** ![sebavan](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/sebavan/32/57_2.png) [@sebavan](https://forum.babylonjs.com/u/sebavan)\ **Post date:** [March 17, 2022, 4:26pm UTC](https://forum.babylonjs.com/t/loading-time-performance-regression/28504/3 "2022-03-17T16:26:32Z")
@bghgary could you have a quick look ? ---
**Author:** ![bghgary](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/bghgary/32/48532_2.png) [@bghgary](https://forum.babylonjs.com/u/bghgary)\ **Post date:** [March 17, 2022, 8:19pm UTC](https://forum.babylonjs.com/t/loading-time-performance-regression/28504/4 "2022-03-17T20:19:10Z")
I can repro. Will investigate. ---
**Author:** ![Leon](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/leon/32/30387_2.png) [@Leon](https://forum.babylonjs.com/u/Leon)\ **Post date:** [March 18, 2022, 1:31pm UTC](https://forum.babylonjs.com/t/loading-time-performance-regression/28504/5 "2022-03-18T13:31:07Z")
What did you find? ---
**Author:** ![bghgary](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/bghgary/32/48532_2.png) [@bghgary](https://forum.babylonjs.com/u/bghgary)\ **Post date:** [March 18, 2022, 4:01pm UTC](https://forum.babylonjs.com/t/loading-time-performance-regression/28504/6 "2022-03-18T16:01:38Z")
I’m still working on it. Stay tuned. ---
**Author:** ![Deltakosh](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/deltakosh/32/26635_2.png) [@Deltakosh](https://forum.babylonjs.com/u/Deltakosh)\ **Post date:** [March 19, 2022, 3:48am UTC](https://forum.babylonjs.com/t/loading-time-performance-regression/28504/7 "2022-03-19T03:48:17Z")
We have the fix!!! Will send a PR sooooon ---
**Author:** ![Deltakosh](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/deltakosh/32/26635_2.png) [@Deltakosh](https://forum.babylonjs.com/u/Deltakosh)\ **Post date:** [March 19, 2022, 4:11am UTC](https://forum.babylonjs.com/t/loading-time-performance-regression/28504/8 "2022-03-19T04:11:27Z")
Here we are! [Fix scene is ready by deltakosh · Pull Request #12214 · BabylonJS/Babylon.js (github.com)](https://github.com/BabylonJS/Babylon.js/pull/12214) ---
**Author:** ![Leon](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/leon/32/30387_2.png) [@Leon](https://forum.babylonjs.com/u/Leon)\ **Post date:** [March 19, 2022, 2:34pm UTC](https://forum.babylonjs.com/t/loading-time-performance-regression/28504/9 "2022-03-19T14:34:03Z")
Awesome! Thanks for looking at it so fast 🚀 ---
**Author:** ![bghgary](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/bghgary/32/48532_2.png) [@bghgary](https://forum.babylonjs.com/u/bghgary)\ **Post date:** [March 21, 2022, 3:49pm UTC](https://forum.babylonjs.com/t/loading-time-performance-regression/28504/10 "2022-03-21T15:49:21Z")
Unassigned @bghgary on March 21, 2022, 3:49pm UTC ---
**Author:** ![Leon](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/leon/32/30387_2.png) [@Leon](https://forum.babylonjs.com/u/Leon)\ **Post date:** [May 3, 2022, 6:48am UTC](https://forum.babylonjs.com/t/loading-time-performance-regression/28504/11 "2022-05-03T06:48:37Z")
@Deltakosh I am still experiencing really slow load times in babylon 5.4 I have multiple colleagues and clients that are reporting it to since our upgrade to v5 For me the Three.js viewer loads the scene and draws the first frame in about 2 seconds But Babylon takes 8.5 seconds. Could you please take a look again and see if you can find what is causing it? If you try these links below, which should load a test model in both the sandbox and the donmccurdy gltf viewer. ```auto https://sandbox.babylonjs.com/?assetUrl=https://cdn.wec360.com/demo/visualization-bundle-premium/views/webgl-exterior/X3w1KXnY@model.glb https://gltf-viewer.donmccurdy.com/#model=https://cdn.wec360.com/demo/visualization-bundle-premium/views/webgl-exterior/X3w1KXnY%40model.glb ``` ---
**Author:** ![sebavan](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/sebavan/32/57_2.png) [@sebavan](https://forum.babylonjs.com/u/sebavan)\ **Post date:** [May 3, 2022, 3:06pm UTC](https://forum.babylonjs.com/t/loading-time-performance-regression/28504/12 "2022-05-03T15:06:54Z")
Assigned @bghgary on May 3, 2022, 3:06pm UTC ---
**Author:** ![sebavan](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/sebavan/32/57_2.png) [@sebavan](https://forum.babylonjs.com/u/sebavan)\ **Post date:** [May 3, 2022, 3:36pm UTC](https://forum.babylonjs.com/t/loading-time-performance-regression/28504/13 "2022-05-03T15:36:33Z")
Also @Leon is it still a regression from 4.2 ? mainly to help us dissect it ---
**Author:** ![Deltakosh](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/deltakosh/32/26635_2.png) [@Deltakosh](https://forum.babylonjs.com/u/Deltakosh)\ **Post date:** [May 3, 2022, 4:50pm UTC](https://forum.babylonjs.com/t/loading-time-performance-regression/28504/14 "2022-05-03T16:50:55Z")
One aspect of the 3js viewer is that they render immediately where we are waiting for everything to be compiled to avoid pop out effects. Babylonj.js sandbox is ready to render pretty quickly but we wait for the shaders to be compiled, for the environment to be loaded and ready and so on… So it is complicated to compare both experiences out of the box @bghgary and @sebavan will dig more into your model anyway to be sure ---
**Author:** ![Deltakosh](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/deltakosh/32/26635_2.png) [@Deltakosh](https://forum.babylonjs.com/u/Deltakosh)\ **Post date:** [May 3, 2022, 4:58pm UTC](https://forum.babylonjs.com/t/loading-time-performance-regression/28504/15 "2022-05-03T16:58:42Z")
Ideally we would need a repro of how it was before (4.2) and how it is now (5.0) @sebavan: You did have one for this case right? ---
**Author:** ![Deltakosh](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/deltakosh/32/26635_2.png) [@Deltakosh](https://forum.babylonjs.com/u/Deltakosh)\ **Post date:** [May 3, 2022, 5:23pm UTC](https://forum.babylonjs.com/t/loading-time-performance-regression/28504/16 "2022-05-03T17:23:29Z")
Ok found it! @Leon: You can see with this PG (by switching between 4.2 and 5.4) that 5.4 is not slower (on my compute here); [Babylon.js Playground (babylonjs.com)](https://playground.babylonjs.com/#AX373J#5) 5.4: (first pixel after 1.7s and gltf loaded after 1s) ![image](https://us1.discourse-cdn.com/flex024/uploads/babylonjs/original/3X/0/a/0aa210472998dd78809b879a82220279e13e2ad6.png) 4.2: (first pixel after 1.7s and gltf loaded after 1s) ![image](https://us1.discourse-cdn.com/flex024/uploads/babylonjs/original/3X/6/4/64d830182f8ad19008225085df5ac0758d728d12.png) ---
**Author:** ![bghgary](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/bghgary/32/48532_2.png) [@bghgary](https://forum.babylonjs.com/u/bghgary)\ **Post date:** [May 3, 2022, 5:28pm UTC](https://forum.babylonjs.com/t/loading-time-performance-regression/28504/17 "2022-05-03T17:28:55Z")
@Leon What browser and OS are you using? ---
**Author:** ![Leon](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/leon/32/30387_2.png) [@Leon](https://forum.babylonjs.com/u/Leon)\ **Post date:** [May 4, 2022, 9:30am UTC](https://forum.babylonjs.com/t/loading-time-performance-regression/28504/18 "2022-05-04T09:30:13Z")
Thanks for the playground. This is very interesting. I’m running a iMac pro from 2017 on MacOS monterey 12.3.1 on Chrome 101 Babylon.js v4.2.1 - WebGL2 - Parallel shader compilation time1: 1.399999976158142 time2: 1603.3999999761581 time3: 4342.100000023842 Babylon.js v5.4.0 - WebGL2 - Parallel shader compilation time1: 1.699999988079071 time2: 1335.199999988079 time3: 6888.199999988079 There is both a large gap between your times and mine, but also between 4.2 and 5. 😅 ---
**Author:** ![Leon](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/leon/32/30387_2.png) [@Leon](https://forum.babylonjs.com/u/Leon)\ **Post date:** [May 4, 2022, 11:23am UTC](https://forum.babylonjs.com/t/loading-time-performance-regression/28504/19 "2022-05-04T11:23:20Z")
Just to make sure it wasn’t chrome that was causing the problems I ran it in safari 15.4 also with the following results: Babylon.js v4.2.1 - WebGL2 - Parallel shader compilation time1: 1000 time2: 1601 time3: 4805 Babylon.js v5.4.0 - WebGL2 - Parallel shader compilation time1: 2001 time2: 2149 time3: 6435 ---
**Author:** ![Leon](https://sea2.discourse-cdn.com/flex024/user_avatar/forum.babylonjs.com/leon/32/30387_2.png) [@Leon](https://forum.babylonjs.com/u/Leon)\ **Post date:** [May 4, 2022, 1:00pm UTC](https://forum.babylonjs.com/t/loading-time-performance-regression/28504/20 "2022-05-04T13:00:01Z")
I had some colleagues do run the tests also just to see the difference between windows an mac **Older laptop i7 2ghz, 16gb ram** **Windows 10, chrome 101** Babylon v4.2.1 time1: 1.799 time2: 1881 time3: 5199 Babylon 5.4.0 time1: 4.700 time2: 3723 time3: 12057 **New 3D rig with good perf** **Windows 11, chrome 101** Babylon v4.2.1 time1: 1.200 time2: 843 time3: 2133 Babylon v5.4.0 time1: 1.300 time2: 1051 time3: 2457 Could it have something to do with parallel shader compilation and how it allocates resources, maybe it doesn’t work correctly on mac or ios? [Next page](https://forum.babylonjs.com/t/loading-time-performance-regression/28504.md?page=2)